peculiarity (n.)

c. 1600, "exclusive possession, private ownership" (a sense now obsolete); 1640s, "a special characteristic of a person or thing," from peculiar + -ity, or else from Latin peculiaritas. Meaning "quality of being peculiar, individuality" is from 1640s; that of "an oddity" is attested by 1777. Related: Peculiarities.